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Principles of Consolidation And Other Matters (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements $ 167,000,000    
Equity method investments lag period 3 months    
Investment income (loss) $ 1,000,000 $ (3,000,000)  
Effective tax rate (as a percent) 23.30% 28.60%  
Unrecognized tax benefits $ 66,000,000   $ 65,000,000
Minimum      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Reasonably possible decrease in unrecognized tax benefits 0    
Maximum      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Reasonably possible decrease in unrecognized tax benefits $ 7,000,000